Improvement in stump-extractors



`To whom `'it anc-y concern:

geen can.

wo.- JOHNSON, or ALMA,. MI`CHIGN.

V Letters PatentiNo. 100,7

7c, dazed MarchY 15, 1870.Y

mpaovemnm I N sTuMP-nxrnAc'roRs.

The Schedule {eferxed to in these Letters Patent and making part f the Same.

Beit known that I, W'. O. J O'HXSON, of Alma. Ain the county of Gratiot, and State ot' Michigan, have in- .Vent-cda new and useful improvement in Stump-Ex# i tractors; and Iido declare that the following is a true and accurate descriptionthereo', reference being had to the accompanying drawings and to lthe letters of reference marked thereon and being a' part of this specification. i

The nature of this invention relates to an improvement in the construction of that`class of machines em-` ployed in extracting stumps from the ground, and lifti ing heavy bodies; and consists in a peculiar arrangement of compcundleveradogs, rack-bar, and proper support, as more fully hereinafter described.,V 1n the accompanying drawings` VA represents a proper frame, which is designed to straddle4 the article to be raised, and whichsustains, by suspension, the working parts of the machine.

` `B are links, suspended from opposite sides of the top of the frame, and to which are, in turn, suspended the clevises'vO, which are pivcted at th'eirlower ends `to thelevers D. 1 i

To the outer ends of these levers are pivoted the V Yconnecting-rods E, the lower ehds of which are in turn pivoted to the yoke F.

Betweentbe ends ofthi's yoke, and by means of the same bolts by which it is pivoted to the rods Eare pivoted the dogs G, the opposite ends of which are designed to engagewith the teeth on either side of the rack-bar H, alternating in their engagement as the k `leversl) are altern-atei y elevated or depressed.

In the rear of the clevises C are pivotcd other conheating-bars, I, to the levers D, so that the point where 'the clevises are pivoted to said levers D shall Ibe midway between the points where the connecting-rods E and I are pivoted to the said levers D.

The lower ends ofthe latter-named connecting-bars are inturn pivoted to the yoke J, through which, as well asthe yoke F, the rack-bar Hfpasses, and has a reciprocating motion. f

Between the sides of the yoke J, at a, are `pivoted other dogs, K, whiclrare also designedto engage `with the teeth on either side of the rack-bar H, tothe lower end of which should be secured a chain or rope, by means of which to 'make fast to the object to be lifted.

The levers, connecting-rods,yokes, and dogs should all be 'so arranged, as shown, that three of the dogs, when the `machine is in operation and a weight attached to the rack-barshall be in engagement with its teeth at ail times, thereby giving the operator an additional leverage over themachines now in use, and entirely preventing any danger of slipping;

I am aware that a pair of levers operating a pair of dogs, in connection with a rack-bar, are now 4in use for the purpose of lifting weights and extracting stumps. I disclaim any part of that invention, but

What I claim as my invention,- and desire to secure The construction of-an apparatus for extracting stumps and lifting heavy bodies, wherein the frame A, links B, clevises 0,levers D, connecting-rods E and 1, yokes F and J, dogs G and K, and rack-bar H, are arranged and .operate substantially as herein described.

' \V. O. JOHNSON. Witnesses: k

Taos. J. TANN,

ALFRED S. 'A'rwoon 

